Electrical upgrades

[Dskater99]

Hi all im currently pushing 1200w rms and will be upgrading to 2100w rms and i still only have 90a alternator and single acid battery up front. Big three is already done. My issue is that i tried to intall a HO alternator but i cant because i have a supercharger kit and an idler pulley is attatched to the alternator. The HO alternator does not have the mounting hole for the pulley so i cant use it. Can i get away with extra batterys in the back untill i buy a different car that i can put an alternator in? Im not sire what to do. Any advice?

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[beatzboi]

PICS! Both alternators have pulleys, they more than likely share the same mounting point. The screw in the middle.

 

[Dskater99]

I have an idler pulley that is not a factory pulley attatched to the altenator housing for my supercharger. The HO alternator does not have the mounting hole i need. It simply wont work unless i took my supercharger off and went back to stock. Ill take pics later tonight.

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[beatzboi]

what car is this?

 

[Dskater99]

95 vw jetta nuespeed supercharged.

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[smoka 10+ year member]

Get the 2nd batt. With 2k you might not need a HO alt.

I'm just over 2k with stock alt and 2 H7 agm batts. No dimming etc.

 

[macsdad 10+ year member]

You might want to put an agm battery up front dude, the largest that fits. Like smoke said, I also have a stock alt albeit it is 150amp, have a d3400 up front and a d975 in the back, and also no dimming on the set up in my sig.

 

[Dskater99]

Bringing up an old post but i have a 90a altenator. I was looking at kinetic hc600 batteries. Could i run 3 or 4 of them in the trunk and keep my lead acid up front?

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[tymoto21 10+ year member]

It is not recommended to mix lead acid and agm

Some people do with zero problems others have trash batteries after

The lead acid rest at a lower voltage so they will constantly draw down the agms

Put 1 hc600 up front and the rest in the rear

Why can't you add the mounting hole on your h/o alt for the idler pully

I'm sure a shop would do it for a hundred bucks or so

Also why 3-4 smaller bats and not just 2 larger ones?

 

[Dskater99]

It will be on a battery isolator so the lead and agm will only be connected together when the car is running so resting voltage shouldnt matter. I work at a shop so i know it cant be done. Also hc600 costs $50 each and a larger agm cost $250. Cheaper to get multiple small ones.

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[Dskater99]

Its an aftermarket supercharger and the idler pulley is not factory i added it in to get the correct belt tension on the supercharger. The HO does not have the same flange i can drill into like the factory one.

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